crazy vibration
Causes of Clutch Chatter or Shudder
Improper break-in procedure
Flywheel not properly resurfaced before installing a new clutch
Flywheel or clutch disc friction surface not parallel with the crank flange surface
Flywheel has severe hard spots or hot spots
Flywheel has an improper step or cup dimension
Defective pressure plate and/or disc
Disc has inadequate or no marcel (not enough cushion between friction facings)
Oil or grease contamination on clutch facings
Worn or damaged clutch linkage
Bent cover assembly and/or clutch disc
Damaged/excessively worn U-joints or CV joints
Misaligned U-joints
Excessive backlash in differential
Excessive driveline angle
Improper gear ratio versus tire diameter
Improperly tuned engine
Worn/damaged engine or transmission mounts
Bad leaf springs, bushings or mounts
Also if your engine was align-bored , the bellhousing alignment needs to be checked due to the crank centerline being changed.